1277855893 has 2 divisors, whose sum is σ = 1277855894. Its totient is φ = 1277855892.

The previous prime is 1277855869. The next prime is 1277855911. The reversal of 1277855893 is 3985587721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1277204644 + 651249 = 35738^2 + 807^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277855893 - 2¹⁷ = 1277724821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277855863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638927946 + 638927947.

It is an arithmetic number, because the mean of its divisors is an integer number (638927947).

Almost surely, 2^1277855893 is an apocalyptic number.

It is an amenable number.

1277855893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277855893 is an equidigital number, since it uses as much as digits as its factorization.

1277855893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 55.

The square root of 1277855893 is about 35747.1102748180. The cubic root of 1277855893 is about 1085.1604576272.

The spelling of 1277855893 in words is "one billion, two hundred seventy-seven million, eight hundred fifty-five thousand, eight hundred ninety-three".